Summary: Depends on D20468. Ref T13276. See PHI1008. When a commit or revision "reverts <hash>", and that's the hash of a commit which has a revision, also write a "reverts" edge to the revision. Test Plan: Created "reverts X" objects for: - a revision; - a commit; - a commit with a revision (both got marked properly). Reviewers: amckinley Reviewed By: amckinley Maniphest Tasks: T13276 Differential Revision: https://secure.phabricator.com/D20469